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http://www.d-toolsblog.com/product-view/critical-si55-update-notice/ Critical SI5.5 Update Notice | D-Tools NewsBlog
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http://www.support.d-toolsblog.com/si/setup/critical-si55-update-notice/ Critical SI5.5 Update Notice « D-Tools Support WikiBlog

In the initial release of SI5.5, archive and restore project functionality is not available to stand-alone users. Pro/LANSync users are not affected.